The pair partied together after the concert at Madison Square Garden

Harry Styles showed off to his new girl Taylor Swift as he sang to her at an after-show bash.

Harry, 18 – who was spotted out with the country singer in New York’s Central Park and then holding hands as they left One Direction‘s Madison Square Garden gig together – is reported to have sang Elton John and Kiki Dee‘s Don’t Go Breaking My Heart to Taylor, 22, as she joined him in a rendition of the classic track.

‘It was the perfect song for a new couple,’ a source tells The Mirror. ‘They were both giggling as they sang to one another.

‘They were still smiling when they disappeared back to her hotel hand in hand in the early hours of the morning.’

The One Direction star couldn’t help but Tweet about the night’s events.

‘Last night was the best thing I have ever done,’ Harry posted on the social networking site.

SEE PICTURES Harry Styles in celebrity tattoos

SEE PICTURES One Direction and Harry Styles sign copies of album Up All Night in New York

SEE PICTURES Harry Styles and One Direction are red carpet guests at the Brits 2012

Natalie Walsh